Police say the area of Huron Court in the Town of Innisfil has since re-opened after an individual was arrested Wednesday morning.
Few details are known, but police had temporally evacuated the area during the incident.
Central region OPP say they made contact with a male individual who surrendered and was taken into custody.
Police say more information will be provided when available.
This incident comes a week after two South Simcoe Police Offices were shot dead while responding to a disturbance at a home.
OPP are providing front-line services to the South Simcoe police region from Oct. 19 to Oct. 21 during the visitations and funeral service for fallen SSPS officers, Constable Morgan Russell and Constable Devon Michael Northrup.
Both the South Simcoe police North Division and South Division buildings, including the Collision Reporting Centres, will be closed to the public during this time, but OPP will be present at both locations.